Does Embodiment of Verbs Influence Predicate Metaphor Processing in a Second Language? Evidence From Picture Priming

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Does Embodiment of Verbs Influence Predicate Metaphor Processing in a Second Language? Evidence From Picture Priming
ORIGINAL RESEARCH
                                                                                                                                          published: 03 November 2021
                                                                                                                                        doi: 10.3389/fpsyg.2021.759175

                                                Does Embodiment of Verbs Influence
                                                Predicate Metaphor Processing in a
                                                Second Language? Evidence From
                                                Picture Priming
                                                Yin Feng 1,2 and Rong Zhou 1,2*
                                                1
                                                  School of Foreign Studies, South China Normal University, Guangzhou, China, 2 Center for Language Cognition and
                                                Assessment, South China Normal University, Guangzhou, China

                                                Distinct from nominal metaphors, predicate metaphors entail metaphorical abstraction
                                                from concrete verbs, which generally involve more action and stronger motor simulation
                                                than nouns. It remains unclear whether and how the concrete, embodied aspects of
                                                verbs are connected with abstract, disembodied thinking in the brains of L2 learners.
                                                Since English predicate metaphors are unfamiliar to Chinese L2 learners, the study
                                                of embodiment effect on English predicate metaphor processing may provide new
                                                evidence for embodied cognition and categorization models that remain controversial,
                         Edited by:             and offer practical insights into L2 metaphor processing and pedagogy. Hence, we
                     Pietro Spataro,            aim to investigate whether the embodiment of verbs, via the activation of sensorimotor
           Mercatorum University, Italy
                                                information, influences two groups of L2 learners during their comprehension of
                    Reviewed by:
                                                conventional and novel predicate metaphors. The results show a significant effect of
                      Akira Utsumi,
                   The University of            embodiment: a stronger facilitation for novel predicate metaphors in both higher-level
     Electro-Communications, Japan              and lower-level groups, and a weaker facilitation for conventional predicate metaphors
                   Hamad Al-Azary,
   Lawrence Technological University,           in the lower-level group. The findings demonstrate preliminary evidence for a graded
                      United States             effect of embodiment on predicate metaphors processing, modulated by L2 proficiency
                 *Correspondence:               and metaphor novelty. The study supports a hybrid view of embodied cognition and
                        Rong Zhou
                                                reveals that sensorimotor aspects of verbs may be the intermediate entity involved in the
            zhourong@m.scnu.edu.cn
                                                indirect categorization.
                   Specialty section:
                                                Keywords: predicate metaphor, embodiment, sensorimotor, L2 proficiency, metaphor novelty, indirect
         This article was submitted to
                                                categorization, intermediate entity
                             Cognition,
               a section of the journal
               Frontiers in Psychology
                                                INTRODUCTION
         Received: 16 August 2021
        Accepted: 11 October 2021               Metaphorical language is not just a poetic expression but also a conceptual device to communicate
      Published: 03 November 2021
                                                abstract ideas. The majority of studies in the past decades have focused on nominal metaphors in the
                            Citation:           typical “A is B” structure (e.g., The rumor was a virus), but few have been conducted on predicate
     Feng Y and Zhou R (2021) Does
                                                metaphors (e.g., The media bent the truth), despite their frequent occurrence in daily discourses
      Embodiment of Verbs Influence
  Predicate Metaphor Processing in a
                                                (Cameron, 2008; Steen et al., 2010; Goatly, 2011). Compared with literal sentences that convey
  Second Language? Evidence From                physical senses (e.g., The repairman bent the pipe), predicate metaphors use verbs figuratively via
                     Picture Priming.           abstraction from concrete action terms. Recently, neural studies found sensorimotor activations
          Front. Psychol. 12:759175.            across brain regions when English natives read predicate metaphors (Chen et al., 2008; Desai
    doi: 10.3389/fpsyg.2021.759175              et al., 2013; Obert et al., 2014; Lai et al., 2019); however, it has not been well-understood how

Frontiers in Psychology | www.frontiersin.org                                         1                                      November 2021 | Volume 12 | Article 759175
Does Embodiment of Verbs Influence Predicate Metaphor Processing in a Second Language? Evidence From Picture Priming
Feng and Zhou                                                                                             Embodiment Effect on Predicate Metaphor

action-based metaphors go beyond embodiment to create                     deep relational alignment will remain in the brain (e.g., give up
abstract thoughts in the brains of L2 learners whose language             something), but the surface sensorimotor properties of the base
proficiency levels could affect difficulties of comprehension and         meaning will be shed (e.g., move the foot forward). In this sense,
embodiment. Furthermore, predicate metaphors comprehension                there may be a graded embodiment for metaphor processing
may be a process of indirect categorization with an intermediate          relative to metaphor novelty (Desai et al., 2013; Jamrozik et al.,
entity (Utsumi and Sakamoto, 2011; Obert et al., 2018), but its           2016).
processing mechanisms in native language and second language                  In the past decade, many behavioral studies have addressed
were not fully studied. The aims of the present study are thus            the embodied qualities of verbs (Richardson et al., 2001, 2003;
to investigate whether and how the embodiment of verbs, via               Wilson and Gibbs, 2007), yet few studies have studied predicate
the activation of sensorimotor properties, influences two groups          metaphors in a sentence context or discourses, and it remains
of L2 learners during their comprehension of conventional                 unclear what type of sensorimotor activation (e.g., visual or
and novel predicate metaphors and to explore the issues of                auditory) could influence predicate metaphor comprehension.
intermediate entity in their processing of predicate metaphors.           For the structure of word meaning, a major division lies between
    A predicate metaphor is a linguistic construction that                the conceptual structure and spatial structure, the latter of which
exemplifies the embodied nature of cognition since verbs                  involves perception and action (Jackendoff, 2002); therefore,
generally entail more action content. Embodied cognition (Lakoff          when a picture denoting an action is presented, the sensorimotor
and Johnson, 1980; Glenberg and Kaschak, 2002; Gibbs, 2006a;              elements in the spatial structure are likely to be activated
Zwaan and Taylor, 2006; Estes et al., 2008; Glenberg, 2010)               before a particular verb meaning is accessed in the conceptual
holds that cognition is grounded in the physical body and                 structure. The imagery of such an action in the spatial structure
sensorimotor system. Abstract concepts can be understood via              can be readily available without retrieving a verb because the
metaphors, which link abstract, less familiar knowledge with              processing systems of verbal stimuli (text) and non-verbal stimuli
concrete and familiar experience. For example, reading tactile            (image) are functionally and structurally independent (dual
metaphors (e.g., a rough day) and taste metaphors (e.g., a                coding theory, Paivio, 2014). In this sense, if one relies on
sweet compliment) can activate sensory regions responsive to              the sensorimotor system when reading predicate metaphors,
touch and taste (Lacey et al., 2012; Citron and Goldberg, 2014).          the imagery (i.e., embodiment) may facilitate abstraction from
Reading action metaphors related to motion content (e.g., bent            concrete meaning and result in faster comprehension.
the truth) can activate regions involved in motor perception                  Relatively few accounts have been proposed to explain how
(Desai et al., 2011, 2013; Lauro et al., 2013). The stronger              predicate metaphors are comprehended. Based on the studies
view of embodied accounts (Gibbs et al., 2004; Gibbs, 2006b)              on nominal metaphors, the categorization theory (Glucksberg,
believes that metaphors are comprehended via sensorimotor                 2001, 2003, 2008; Torreano et al., 2005) was proposed to account
simulation, just as literal language is comprehended; while the           for predicate metaphor processing. In the case of “My job
weaker view (Boroditsky and Ramscar, 2002; Cardillo et al.,               is a jail,” the words “job” and “jail” are both exemplars of
2012; Jamrozik et al., 2016) argues that only novel metaphors             a superordinate category “confining and unpleasant situation.”
draw on sensorimotor information from the source domain,                  Similarly, in the predicate metaphor “The rumor flew through
but the representation of source domain becomes abstracted                the office,” the verb “fly” is a prototypical exemplar of the
as metaphoric use increases. A predicate metaphor is a typical            superordinate category “fast travel.” This process is a direct
vehicle to address these mixed views as it allows a verb to be used       categorization (Glucksberg, 2001, 2003; Torreano et al., 2005)
literally to describe physical action and metaphorically to convey        in which metaphorical meanings are achieved through direct
abstract ideas.                                                           abstraction from a superordinate category. However, Utsumi and
    Recent neural studies have supported the embodied views of            Sakamoto (2011) doubted this explanation because the semantic
predicate metaphor processing. For example, a few secondary               structures of verbs are qualitatively different from those of
motor regions were found to be involved when participants                 nouns. Specifically, verbs involve events and action, and semantic
read familiar predicate metaphors, but the primary sensory and            relations entail rich elaborations and thematic roles, such as the
motor regions were more activated when they read unfamiliar               hyponymy “To V1 is to V2 in some particular manner” (e.g., to
novel metaphors (Desai et al., 2011, 2013; Cardillo et al.,               bend is to force a different shape or direction). Nouns, however,
2012), suggesting that novel predicate metaphors relied more on           refer to objects, and the semantic relations between nouns are
sensorimotor information corresponding to the verbs. However,             mostly class inclusion, such as the superordination “A N1 is a
other studies showed inconsistent motor activations in the brain          N2” (e.g., A canary is a bird). Verbs are less likely to rely on
(Watson et al., 2013). It seems that novelty or conventionalization       hierarchical relations (Chen et al., 2008); therefore, the meanings
of metaphors plays a role in the mixed results on embodiment.             of predicate metaphors may not be created via the superordinate
According to the career of metaphor theory (Bowdle and                    categorization of the events that are evoked by verbs.
Gentner, 2005), all metaphors start as novel expressions, then                An intermediate entity is assumed to be activated by verbs
evolve into conventional expressions, and eventually become               before a figurative category of actions is finalized (Utsumi and
literal expressions that lose the figurative meaning. For predicate       Sakamoto, 2011). In the example The rumor flew through the
metaphors, the figurative meaning centers on the concrete                 office, the intermediate entity such as things that fly (e.g., plane
motion aspect of verbs. When predicate metaphors (e.g., kick the          or bird) or an imaginary scene of flying, may be evoked before
habit) are conventionalized over time, the salient meanings with          an abstract meaning “travel fast” was created. In this case,

Frontiers in Psychology | www.frontiersin.org                         2                                 November 2021 | Volume 12 | Article 759175
Feng and Zhou                                                                                             Embodiment Effect on Predicate Metaphor

understanding a predicate metaphor is a two-stage process with            two information sources (i.e., picture and text) while higher-level
indirect categorization. An N400-LPC component observed in an             learners can perform well with only one source (i.e., text). In
ERP study (Obert et al., 2018) showed that semantic integration           this sense, the embodiment effect of action-related pictures on
occurred during metaphor processing, and this result appeared             predicate metaphor comprehension will be different among L2
consistent with the indirect view of categorization. However,             learners of different levels.
these studies failed to specify the intermediate entity. Will the             In summary, it remains unknown whether and how predicate
intermediate entity be the specific sensorimotor association from         metaphor processing draws from the sensorimotor system, and
verbs or the prototypical agent of verb? When reading novel               the mechanism of intermediate entity during predicate metaphor
expressions such as The taxes pinch the industry, does one                processing has been unclear. The mixed findings in previous
think of the act of pressing something between a thumb and                literature could be a result of difference in metaphor novelty,
a finger, a painful feeling, or a pair of shoes (a prototypical           language proficiency and experimental paradigms. Given that
entity that pinches)? When reading familiar expressions such              English predicate metaphors are unfamiliar to Chinese L2
as The media bent the truth, does one directly retrieve the               learners whose mother tongue has less of this construction,
abstract meaning “distort” from long-term memory or rely on the           a second language perspective could help to reveal more
concrete act of “causing to curve”? In this study, we assumed that        about the embodied features of predicate metaphor processing.
if predicate metaphors are processed via intermediate entities,           Taken together, we form the following questions: (1) Does
the sensorimotor aspects of verbs, then the pictures describing           the embodiment of verbs (i.e., the activation of sensorimotor
verb-related action can facilitate the understanding of metaphors.        aspects) influence L2 predicate metaphor processing? (2)
    It is well-known fact that understanding metaphors in a               How is the embodiment effect different between higher-level
second or foreign language may impose great difficulty due to             and lower-level Chinese L2 learners when they read English
linguistic barrier. Thus, untangling how L2 learners process L2           conventional predicate metaphors and novel metaphors? (3) Are
metaphors could have important insights for those trying to               L2 predicate metaphors comprehended via intermediate entity in
teach a second language (Littlemore, 2009, 2019). There has               an indirect process?
been a great body of literature exploring relationships between
metaphors processing and second language learning in terms                MATERIALS AND METHODS
of conceptual metaphor theory (Yasuda, 2010; Lu and Sun,
2017), metaphorical competence (Danesi, 1993; Littlemore and              Participants
Low, 2006), metaphor awareness (Guo, 2007; Chen and Lai,                  Participants were 100 paid native Chinese undergraduates who
2012; Boers, 2013), imagery (Ifantidou and Hatzidaki, 2019) and           majored in English and have been learning English as second
individual differences (Johnson and Rosano, 1993; Wegner et al.,          language since primary school. They were divided into two
2020). Previous ERPs studies on bilingual metaphor processing             proficiency groups—higher-level group were 45 junior English
found neural similarities and difference in metaphor processing           majors (age range 21–23) who passed the National Test for English
between L1 and L2 (Dong, 2013; Park and Chung, 2013; Xue                  Major, Band 8), and lower-level group (age range 17–18) were
et al., 2014; Liu, 2016; Jankowiak et al., 2017, 2021; Wang, 2018).       55 freshmen who scored above 120 on the National College
Although metaphoric meaning integration might be of similarity            Matriculation English Test. Informed consent was obtained from
in L1 and L2, L2 learners require more intensive cognitive                each participant prior to the experiment.
mechanism or continued effort in lexicon-semantic access and
tended to adopt L1 neural pathway to process L2 metaphors.                Materials
However, Citron et al. (2020) found L2 speakers were less                 The experiment contained three types of materials - target
affected by increasing metaphoricity than L1 speakers, suggesting         sentences, comprehension sentences and pictures. A total
metaphorical language is not necessarily engaging in L2 speakers.         of 96 target sentences (see Table 1 and Supplementary file)
Yet this research did not take L2 proficiency into consideration          were equally divided into four groups: conventional predicate
since several neural studies found that L2 proficiency difference         metaphors (CMs), novel predicate metaphors (NMs) and
had an impact on neural activities in the brain areas responsible         their corresponding literal sentences (L-CMs, L-NMs). They
for novel metaphors (Dong, 2013; Liu, 2016).                              were selected from previous studies (Cardillo et al., 2012;
    Most literature of L2 metaphor comprehension focused                  Desai et al., 2013) and two online dictionaries (https://www.
on nominal metaphors and temporal-spatial metaphors, but                  thefreedictionary.com/ & https://dictionary.cambridge.org/).
lacked discussion upon predicate metaphors. Most ERPs studies                 Metaphors were rated in terms of novelty ratings by another
described the processing mechanism at the neural level, but               group of 42 undergraduate English majors using a 7-point scale
behavioral evidences that probe into the embodied features of L2          (1 being very common, 7 being very novel). The novelty degree
metaphor processing are insufficient. As predicate metaphors are          of novel metaphors was significantly higher than conventional
cognitively challenging, how sensorimotor stimulation facilitates         ones [t (1,46) = 15.991, p = 0.000]. All sentences were edited to
L2 predicate metaphor processing becomes an important                     fit experimental purposes - predicate metaphors use action verbs
concern. According to dual coding theory, verbal information              figuratively while literal sentences had the same verbs to describe
(e.g., language) and non-verbal information (e.g., image) both            an event. The subjects in metaphors and literal sentences were
contribute to cognition. From a bilingual point of view (Schnotz          designed to induce either figurative or literal meanings of verbs.
and Horz, 2010), lower-level L2 learners can perform better with          In the metaphor set, the subjects were the entities that make

Frontiers in Psychology | www.frontiersin.org                         3                                 November 2021 | Volume 12 | Article 759175
Feng and Zhou                                                                                                                       Embodiment Effect on Predicate Metaphor

TABLE 1 | Examples of the four types of target sentences and comprehension sentences.

Sentence type                             Target sentences                                                      Comprehension sentences in Chinese (L1)
                                          in English (L2)

CM                                        The newspaper bent the truth.                                         报纸歪曲了事实。 (bào zhǐ wāi qū le shì shí)
L-CM                                      The repairman bent the pipe.                                          修理工掰弯管子。 (xiū lǐ gōng bāi wān guǎn zi)
NM                                        The tax pinched the industry.                                         税收损伤这个行业。 (shuì shōu sǔn shāng zhè gè háng yè)
L-NM                                      The man pinched my face.                                              男人捏了捏我的脸。 (nán rén niē le niē wǒ de liǎn)

CM, conventional metaphor; NM, novel metaphor; L-CM & L-NM are the literal counterparts to conventional metaphors and novel metaphors, respectively. Underlined words indicate
the English verbs.

TABLE 2 | Means of sentential and lexical properties of metaphors and literals.             TABLE 3 | Percentage of concept agreement, mean visual complexity and
                                                                                            familiarity.
Properties             CMs             Literals           NMs             Literals
                                                                                            Properties                 Related pictures              Unrelated pictures
                     M (SD)            M (SD)            M (SD)           M (SD)
                                                                                                                      CMs              NMs           CMs             NMs
Sentences                                                                                                            M (SD)           M (SD)        M (SD)         M (SD)
Novelty            2.229 (0.60)      1.178 (0.20)     4.915 (0.56)      1.349 (0.43)
Familiarity        5.482 (0.74)      5.724 (0.71)     4.187 (1.02)      5.701 (1.00)        Concept agreement      0.909 (0.53)    0.910 (0.07)   0.870 (0.19)   0.859 (0.18)

Reading ease       6.221 (0.43)      6.344 (0.40)     5.777 (0.56)      6.091 (0.68)        Visual complexity      1.954 (0.28)    2.121 (0.32)   2.125 (0.72)   2.030 (0.66)

Words              5.540 (0.66)      5.670 (0.82)     5.540 (0.66)      5.620 (0.82)        Familiarity            4.258 (0.26)    4.076 (0.38)   4.270 (0.63)   4.205 (0.58)

Letters            25.46 (2.02)      25.08 (3.12)     25.58 (3.40)      23.88 (3.84)        CMs are conventional metaphors, and NMs are novel metaphors.
Verbs
Letters            4.580 (0.97)                       5.000 (0.93)
Frequency          0.865 (0.80)                       0.532 (0.62)                          verbs from conventional and novel metaphors [verbs in CMs:
Familiarity        6.607 (0.50)                       6.227 (0.81)                          MHigher = 6.626, MLower = 6.564, t (1,46) = 0.407, p > 0.05;
Concreteness       5.008 (0.95)                       5.115 (0.52)                          verbs in NMs: MHigher = 6.276, MLower = 6.178, t (1,46) = 0.402,
Imageability       5.242 (0.67)                       5.295 (0.49)                          p > 0.05]. Both groups know the verbs well and the embodiment
Embodiment         6.085 (0.53)                       5.798 (1.19)                          priming from action pictures would not be a result of differences
                                                                                            in verb familiarity. No difference was found in the familiarity of
CMs are conventional metaphors, and NMs are novel metaphors. Frequency values were
taken from iWeb as average log per million frequency. The values for concreteness and
                                                                                            conventional metaphors [CM: MHigher = 5.034, MLower = 4.792,
imageability were converted from the MRC Psycholinguistic Database (Coltheart, 1981).       t (1,46) = 1.200, p > 0.05]. Since familiarity is correlated with the
The ratings for embodiment were based on relative embodiment (Sidhu et al., 2014).          frequency in the corpus and conventionality refers to the degree
                                                                                            to which an expression is associated with figurative meaning (Al-
literal physical actions seemingly unlikely (e.g., the newspaper                            Azary and Katz, 2021), the metaphor familiarity was adopted to
and the tax), which encourages participants to discover the non-                            represent conventionality. The ratings showed that CMs were
literal aspects of metaphors and abstract figurative meanings. In                           largely considered conventional to both groups.
contrast, the subjects in literal sentences are always persons or                                Comprehension sentences were Chinese literal sentences
animate entities (e.g., repairman and father). Metaphorical and                             that were either correct or wrong translation of English
literal sentences were matched in terms of syntactic forms, subject                         metaphors and literal counterparts. It was designed to encourage
animacy and abstraction levels. Three native English speakers                               attentiveness and examine the comprehension accuracy.
proofread the sentences to guarantee naturalness.                                           Participants should judge whether the Chinese translations
    Another 34 undergraduate English majors rated the linguistic                            were correct interpretations of English metaphors or literals. All
proprieties of verbs and target sentences in Table 2 using a 7-                             Chinese sentences, translated and proofread by two proficient
point Likert scale. Critically, a significant difference emerged                            Chinese-English bilinguals, were matched in the number of
between conventional metaphors and novel metaphors in the                                   Chinese characters, interpretability and familiarity (ratings
sentence familiarity (p = 0.000) and reading ease (p = 0.005)                               assigned by 20 Chinese speakers, all ps > 0.05). The yes/no
since the novel metaphors were less familiar and more difficult to                          answers to comprehension tasks were equal in numbers and
understand. There were no striking differences in the frequency,                            counterbalanced across metaphors, literals and fillers.
familiarity, concreteness, imageability and relative embodiment                                  Pictures were the priming stimuli and were divided into
of verbs or in the number of words and letters in target                                    action-related pictures and unrelated pictures. Related pictures
sentences (see Table 2, all ps > 0.05). In addition, a separate 7-                          carry action association and sensorimotor elements relevant to
point rating on verb familiarity and metaphor familiarity was                               the verbs while unrelated pictures are irrelevant to action and
conducted by another 30 senior English majors and 30 freshmen                               depict static objects that have little motor association. These
English majors. There was no familiarity difference between                                 stimuli are based on a picture-naming study (Zhang and Yang,
higher-level learners and lower-level learners when they read the                           2003) or other picture banks on the internet and then edited for

Frontiers in Psychology | www.frontiersin.org                                           4                                         November 2021 | Volume 12 | Article 759175
Feng and Zhou                                                                                              Embodiment Effect on Predicate Metaphor

experimental purposes. They are drawings in white lines with               (1,90) = 213.260, p = 0.000, ηp2 = 0.703; F2 (1,46) = 66.387,
black ground and rated by 56 undergraduates in terms of picture-           p = 0.001, ηp2 = 0.591], and novelty [F1 (1,90) = 126.12, p = 0.000,
concept agreement, visual complexity and familiarity. There were           ηp2 = 0.584; F2 (1,46) = 12.529, p = 0.001, ηp2 = 0.214]. The
no significant differences between action-related pictures and             between-subjects effect of proficiency was also significant [F1
action-unrelated pictures (see Table 3, all ps > 0.05).                    (1,90) = 4.358, p = 0.040, ηp2 = 0.046; F2 (1,46) = 5.676,
                                                                           p = 0.021, ηp2 = 0.110]. Pairwise comparison showed that
Procedure                                                                  participants spent less time processing predicate metaphors in the
The sentences and pictures were presented visually on the screen           action-related pictures condition than in the unrelated condition
(see Figure 1). After 500 ms fixation, a picture was presented             (MRelated = 3022.7 ms < MUnrelated = 3240.4 ms, p = 0.000);
for 2,000 ms when participants decided whether it depicted an              literal sentences were processed much faster than metaphorical
action or static object as quickly as possible with a button press.        sentences (ML = 2825.1 ms < MM = 3438.0 ms, p = 0.000); all
Immediately, a target sentence followed, and participants were             target sentences in the conventional conditions were processed
asked to press the space bar as soon as they understood it.                faster than in the novel condition (MCM = 2971.4 ms < MNM
Reaction times (RTs) were measured from the onset of target                = 3291.8 ms, p = 0.000). Higher-level group spent less time
sentences until appropriate keys were pressed. Then, Chinese               in reading target sentences than lower-level group did (MHigh
comprehension sentences appeared, and participants decided                 = 2941.3 ms < MLow = 3321.9 ms, p = 0.040).
whether the translations were correct by pressing keys. Accuracy               The two-factor interactions were significant between sentence
in comprehension tasks was recorded. Each participant read                 type and novelty (F1 = 56.732, p = 0.000, ηp2 = 0.387; F2 = 17.843,
each target sentence, either primed with an action-related picture         p = 0.000, ηp2 = 0.279), between prime and sentence type
or unrelated picture, once. Metaphors, literals and priming
                                                                           (F1 = 6.032, p = 0.016, ηp2 = 0.063, F2  0.05). In the related
comprehension accuracy for higher-level group and lower-level              priming conditions, literals were processed much faster than
group is 91 and 89%, respectively, indicating that the participants        metaphor (MM = 3309.6 ms < ML = 2783.1 ms, t (1,183) =
were engaged and attentive in the experiment. The analysis of              10.496, p = 0.000) and in the unrelated conditions, the differences
reaction time was performed on the correct trials.                         between sentences types were a bit greater (MM = 3622.4 ms
    Table 4 shows the mean reaction time and mean                          < ML = 2910.5 ms, t (1,183) = 13.081, p = 0.000). Similarly,
accuracy. Concerning the data of metaphors, we found that                  conventional targets were read faster than novel targets when
conventional metaphors and novel metaphors were processed                  they were primed with the pictures of actions (MC = 2918.7 ms
faster in the related priming condition than the unrelated                 < MN = 3072.4 ms, t (1,183) = −3.248, p = 0.001), but
priming condition (CM: MRelated = 3073.8 ms < MUnrelated                   when the pictures were not action-related, the differences were
= 3289.3 ms, p = 0.000; NM: MRelated = 3545.4 ms < MUnrelated              slightly greater (MC = 3174.0 ms < MN = 3460.5 ms, t (1,183)
= 3955.4 ms, p = 0.000). Specifically, in the higher-                      = −6.983, p = 0.000). Figure 2 showed that the time gap
level group, novel metaphors had a significant priming                     between conventional targets and novel targets was smaller in
effect (MRelated = 3328.9 ms < MUnrelated = 3661.1 ms,                     the related-picture condition than in the unrelated conditions,
p = 0.002) on reaction time while conventional metaphors                   suggesting the embodied priming effect was influenced by
and literals did not; in the lower-level group, the strongest              metaphor novelty.
priming effect was observed in the novel metaphors                             Accuracy data presented a main effect for prime only with item
(MRelated      = 3712.0 ms < MUnrelated              = 4181.9 ms,          analysis (F2 = 4.697, p = 0.035, ηp2 = 0.093) but a stronger effect
p = 0.000,), followed by the conventional metaphors                        for novelty (F1 = 37.303, p = 0.000, ηp2 = 0.239; F2 = 7.835,
(MRelated = 3236.4 ms < MUnrelated = 3480.1 ms, p = 0.004).                p = 0.007, ηp2 = 0.146). Proficiency had little effect on accuracy
Therefore, the results of priming size seems to present a gradual          (F1 = 3.032, p > 0.05; F2
Feng and Zhou                                                                                                                     Embodiment Effect on Predicate Metaphor

 FIGURE 1 | Procedure in the priming condition.

TABLE 4 | Mean (SD) reaction time (RTs) of target sentences and accuracy (ACC).

Sentence type          Level                               RTs (ms)                                 Diff.                           ACC (%)                           Diff.

                                        Related prime                  Unrelated prime                            Related prime             Unrelated prime
                                                M (SD)                      M (SD)                                    M (SD)                     M (SD)

CMs                    High              2862.5 (770.5)                 3041.2 (918.1)             178.7             92.9 (7.7)                 91.8 (7.3)           −1.0
                       Low               3236.4 (862.4)                 3480.1 (1135.8)            243.7             89.3(10.1)                 88.8 (9.1)           −0.5
                       Total             3073.8 (840.3)                 3289.3 (1063.9)            205.5             90.8 (9.3)                 90.1 (8.5)           −0.3
NMs                    High              3328.9 (945.6)                 3661.1 (1138.7)            332.2             91.3 (9.1)                 89.4 (9.5)           −1.9
                       Low              3712.0 (1158.1)                 4181.9 (1334.9)            469.9             87.1 (9.9)                 88.6 (9.5)           −1.5
                       Total            3545.4 (1082.3)                 3955.4 (1273.5)            410.0             88.9 (9.7)                 88.9 (9.4)            0.0
L-CMs                  High              2568.3 (797.3)                 2673.6 (742.2)             105.3             93.6 (6.2)                 90.3 (9.3)           −3.2
                       Low               2913.7 (943.0)                 2995.3 (934.6)              81.7             92.6 (7.6)                 92.3 (7.9)           −0.3
                       Total             2763.5 (894.7)                 2855.4 (866.8)              91.9             93.0 (7.0)                 91.5 (8.5)           −1.5
L-NMs                  High              2607.3 (765.1)                 2787.3 (777.0)             180.1             88.8 (9.9)                 86.1 (9.4)           −2.7
                       Low               2952.9 (818.1)                 3102.8 (919.2)             149.9             86.4 (9.8)                 86.4 (11.1)           0.0
                       Total             2802.6 (809.7)                 2965.6 (870.1)             163.0             87.5 (9.9)                 86.3 (10.4)          −1.2

CMs are conventional metaphor; NMs are novel metaphor; L-CMs & L-NMs are the literal counterparts to conventional metaphors and novel metaphors, respectively; High and Low
refer to higher-level learners and lower-level learners, respectively. Diff. refers to the priming size between priming conditions.

    For higher-level learners, the three-way ANOVA of prime                              and L-NMs did not (ML−CM = 2621 ms < ML−NM = 2697 ms,
(2) × sentence type (2) × novelty (2) showed significant main                            p > 0.05).
effects of prime [F1 (1,39) = 17.356, p = 0.000, ηp2 = 0.308;                               Although a three-factor interaction was not observed,
F2 (1,23) = 33.831, p = 0.000, ηp2 = 0.595], sentence type [F1                           the reaction times of novel metaphors were greatly
                                                                                         reduced when primed with related pictures, but those
(1,39) = 110.995, p = 0.000, ηp2 = 0.740; F2 (1,23) = 35.055,
                                                                                         of conventional metaphors were not affected [see
p = 0.000, ηp2 = 0.604] and novelty [F1 (1,39) = 46.184, p = 0.000,                      Table 4, NM: MRelated = 3328.9 ms < MUnrelated               =
ηp2 = 0.542; F2 (1,23) = 8.892, p = 0.007, ηp2 = 0.279]. Yet                             3661.1 ms, t (1,79) = −3.272, p = 0.002; CM: MRelated =
different to the four-way ANOVA, only one interaction effect was                         3328.9 ms < MUnrelated = 3661.1 ms, t (1,79) = −2.018,
found between sentence type and novelty [F1 (1,39) = 24.619,                             p > 0.05]. This result may be due to participants’ higher
p = 0.000, ηp2 = 0.387; F2 (1,23) = 11.921, p = 0.002, ηp2                               L2 proficiency and familiarity with conventional metaphors.
= 0.341]. The reaction time of conventional metaphors and                                Higher-level L2 learners draw on the sensorimotor information
novel metaphors differed greatly [MCM = 2952 ms < MNM                                    of verbs when they comprehend unfamiliar predicate metaphors
= 3495 ms, t (1,79) = −8.409, p = 0.000], while that of L-CMs                            while the concrete aspects of verbs are not essential when they

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Feng and Zhou                                                                                                       Embodiment Effect on Predicate Metaphor

TABLE 5 | Results of four-way ANOVA analysis on RTs.                                91.6% < MUnrelated = 89.4%, p = 0.013), and less accuracy in
                                                                                    the novel groups (MCM = 92.1% < MNM = 88.9 %, p = 0.000).
Effect                                          F value    p             ηp2
                                                                                    Neither the main effect of sentence type nor any interaction effects
Prime                                           46.79     0.000   ***   0.342       were found in comprehension accuracy.
Sentence type                                   213.3     0.000   ***   0.703           For lower-level group, the three-way ANOVA of reaction time
Novelty                                         126.12    0.000   ***   0.584       revealed significant main effects of prime [F1 (1, 51) = 31.632,
Proficiency                                     4.358     0.040   *     0.046
                                                                                    p = 0.000, ηp2 = 0.383; F2 (1, 23) = 32.988, p = 0.000, ηp2 =
Prime x proficiency                             0.342     0.560         0.004       0.589], novelty [F1 (1, 51) = 85.891, p = 0.000, ηp2 = 0.627; F2
Sentence type x proficiency                     1.339     0.250         0.015       (1, 23) = 4.453, p = 0.046, ηp2 = 0.162] and sentence type [F1
Novelty x proficiency                           0.139     0.710         0.002       (1, 51) = 117.68, p = 0.000, ηp2 = 0.698; F2 (1, 23) = 31.558,
Prime x sentence type                           6.032     0.016   *     0.063       p = 0.000, ηp2 = 0.578]. Although the results of main effects were
Prime x novelty                                 5.208     0.025   *     0.055       similar between two groups, two significant interactions were
Sentence type x novelty                         56.73     0.000   ***   0.387       found between sentence type and novelty [F1 (1, 51) = 33.838,
Prime x novelty x proficiency                   0.083     0.773         0.001       p = 0.000, ηp2 = 0.399; F2 (1, 23) = 6.093, p = 0.021, ηp2 = 0.209]
Prime x sentence type x novelty                 1.089     0.299         0.012       and prime and sentence type [F1 (1, 51) = 6.060, p = 0.017,
Sentence type x novelty x proficiency           0.139     0.711         0.002       ηp2 = 0.106; F2 (1, 23) = 1.195, p = 0.286]. Based on the data
Prime x sentence type x novelty x proficiency   0.122     0.728         0.001       of metaphors, the interaction between prime and novelty was also
***p < 0.001 and *p < 0.05.
                                                                                    significant [F1 (1, 51) =6.624, p = 0.013, ηp2 = 0.115; F2
Feng and Zhou                                                                                             Embodiment Effect on Predicate Metaphor

that conventionalization or abstraction plays a crucial role–             Metaphor Novelty and L2 Proficiency
novel metaphors rely more on sensorimotor information                     Novel metaphors were found to be linked with creative thinking
about source concept, but their figurative meanings can                   (Rataj et al., 2018; Wang et al., 2019) and require deeper
become abstracted through repeated use and conventionalized.              processing. The career of metaphor theory (Bowdle and Gentner,
Sensorimotor information is gradually minimized or shed while             2005) holds that when first reading a novel metaphor, people
core abstract meanings remain salient (Chen et al., 2008;                 prefer it to be expressed in simile form that involves an explicit
Binder and Jeffrey, 2016; Zwaan and Rolf, 2016). According                comparison (e.g., A is like B), but it shifts into a metaphoric
to a graded view of conceptual embodiment (Desai et al.,                  form (e.g., A is B) over the course of familiarization. Metaphoric
2011), conceptual representation consists of multiple levels of           abstraction derived from the comparison was stored in memory,
abstraction from sensorimotor inputs, but access to abstract              and people categorize metaphors as members of an abstract
meaning is subject to frequency or familiarity. For conventional          category. Likewise, predicate metaphors follow such a natural
metaphors, the representations existing in the brain are sufficient       history - evolving from novel to familiar metaphors until they
for adequate and fast processing. For novel metaphors, the                lose most of their figurative meaning (Schmidt et al., 2010; Desai
stimulation of sensorimotor information can contribute to a               et al., 2011, 2013; Cardillo et al., 2012). In line with this, novel
better understanding of new metaphoric meaning.                           metaphors seem to be more susceptible to embodiment priming
    We postulate that if the sensorimotor system does have                while conventional metaphors are not.
an important role, the priming of action pictures should                      Regarding a second language, however, a different result is
be outstanding on L2 predicate metaphor processing. This                  observed: higher-level L2 learners received a significant priming
assumption was born out of embodied views, and the imagery                effect only in the novel metaphors whereas this effect was found
account that the images play a role in prompting “emergent”               in both conventional metaphors and novel metaphors among
properties, such as a feeling or experience, which are not                lower-level L2 learners. The results demonstrate a consistent
directly linked with the literal meaning of the metaphor vehicle          effect that has been shown with native English speaker in a
(Carston, 2010; Ifantidou and Hatzidaki, 2019). Our findings              cross-modal lexical priming study (Al-Azary and Katz, 2021).
show a significant priming effect among higher-level L2 learners          They found low-familiar nominal metaphors (e.g., Health is glass)
- novel metaphors benefited from embodiment effect of action              primed bodied-action associates (e.g., break) but not abstract
pictures while conventional metaphors did not. However, lower-            associates (e.g., fragile), and low-familiar metaphors were hence
level L2 learners processed both types of metaphor much                   processed via simulations, whereas high-familiar metaphors only
faster in the related-picture priming condition (see Table 4.             primed abstraction associates. Given that metaphor novelty is
Diff Lower−NM = 469.9 ms, Diff Higher−NM = 332.2 ms; Diff                 relative to familiarity and language proficiency, lower-level L2
Lower−CM = 243.7 ms), which suggests that lower level L2 brains           learners and novel predicate metaphors are more likely to receive
may rely more on sensorimotor system and these concrete                   greater priming effect by sensorimotor activation.
experiences may not be eliminated in the conventional metaphor                Graded salience hypothesis (Giora, 1997, 2003) proposed that
processing. Such L2 evidence pertains to previous L1 studies              metaphorical meanings that are highly salient can be accessed
(Desai et al., 2013; Jamrozik et al., 2016) and also echoes the           first. The novel metaphors in native languages and conventional
graded view of conceptual embodiment.                                     metaphors in second languages were found to be activated in the
    From the bilingual perspective of dual coding theory (Soh,            same areas of right hemisphere, responsible for non-salient and
2010; Paivio, 2014), verbal systems of bilinguals are separate,           novel meaning. In other words, metaphors that are conventional
but their non-verbal systems are generally shared. It has been            to native speakers could appear familiar to proficient L2 learners
predicted that lower-level L2 learners will perform better with           but unfamiliar to less proficient learners. This might be relevant
two information sources (e.g., pictures and text) while higher-           to our findings as lower L2 proficiency may render less salience
level learners will perform well with only one source (e.g.,              in conventional metaphors, embodied picture priming may pre-
text, Schnotz and Horz, 2010). This may explain why the                   activate such salience and help less proficient L2 learners to
priming benefits from pictures in this study were greatest                understand both conventional and novel predicate metaphors.
when lower-level L2 learners read novel metaphors while little                Besides, a given concept is distributed over multiple modality-
benefits were found for the higher-level group when they read             specific systems. For example, patients with motor system
conventional metaphors.                                                   impairment shifted their reliance on motion-specific information
    Studies have found an embodiment effect of pictures and               to representations in the visual system (Barsalou, 2016). Then,
gestures on word learning and memories (Mayer et al., 2015)               in the case of lower-level L2 learners, they may benefit
or embodied representations in abstract words (Meteyard et al.,           from seeing multiple sensorimotor information from visual
2012; Borghi and Zarcone, 2016; Repetto et al., 2017), yet for the        pictures when they encounter difficulties in understanding
first time we observe a graded priming effect of embodiment,              predicate metaphors.
subject to L2 proficiency levels and one type of sensorimotor
input - pictures representing action. Since a simple opposition
between the strong and weak view of embodiment does not                   Sensorimotor Elements as Intermediate
capture the subtleties (Mahon and Hickok, 2016), a hybrid and             Entity
graded view of the embodiment effect, regarding other factors,            There has long been debate as to whether metaphors are
should be necessary to a sufficient theory.                               processed as abstractions or concrete representation. As an

Frontiers in Psychology | www.frontiersin.org                         8                                 November 2021 | Volume 12 | Article 759175
Feng and Zhou                                                                                               Embodiment Effect on Predicate Metaphor

abstraction view, direct categorization (Torreano et al., 2005;             the lexical levels are usually separated. For predicate metaphors,
Glucksberg, 2008) holds that categorization of predicate                    strengthening the link from an L2 verb to an L1 concept
metaphors is a course of abstraction from verbs, directly                   may help an L2 learner to retrieve abstract meanings faster.
attributing properties to topics. However, studies have shown               The dual coding theory of bilingual memory (Paivio and
that predicate metaphor processing may undergo indirect                     Csapo, 1969; Paivio, 2014) proposes that words are represented
categorization via an intermediate entity (Utsumi and Sakamoto,             cognitively by verbal codes (e.g., text) and non-verbal codes
2007, 2011). In view of embodied cognition and simulation view,             (e.g., image), and semantic and sensorimotor information
we postulate that this intermediate entity might be sensorimotor            about concrete words is located in an imaginal system that
aspects of verbs, and concrete features of an action concept play           is shared by L1 and L2. Therefore, action pictures that
a role in L2 predicate metaphor processing. The findings of the             stimulate L2 mental images and deliver semantic-sensorimotor
present study gave preliminary evidence to our assumption.                  information of verbs are likely to mediate access to the L1
   An intermediate entity could be the prototypical agent                   concept and thus facilitate L2 learners’ comprehension of
that performs an action literally referred to by a verb or an               predicate metaphors.
abstract action obtained by abstracting a verb, but previous                   In the classroom, L2 teachers can use concrete pictures
studies failed to identify what was involved (Caillies and                  describing the action of verbs or encourage a mental simulation
Declercq, 2011; Utsumi and Sakamoto, 2011; Obert et al.,                    of the imagery of the action. Since lower-level L2 learners will
2018). In the present study, the sensorimotor information has a             perform better with both verbal and non-verbal information
priming effect on novel metaphors and lower-level L2 learners,              (Schnotz and Horz, 2010), a special emphasis on multimodal
but did not affect higher-level learners’ comprehension on                  instruction concerning verb embodiment or arousal of
conventional metaphors. This suggests that lower-level learners             their sensor-motor-affective system becomes important for
process predicate metaphor via “sensorimotor” intermediate                  L2 learners’ comprehension and memory. In addition, an
entity through an indirect way, whereas higher-lever leaners                explanation about intermediate entities, such as sensorimotor
may go through direct categorization in which figurative                    features and prototypical agents of verbs, could help them
meaning is understood via abstraction but concrete meanings                 understand how concrete aspects of verbs are mapped to
of verbs are shed (Cardillo et al., 2012; Desai et al., 2013;               abstract meaning.
Jamrozik et al., 2016). At this point, we proposed a hybrid
model of categorization for L2 predicate metaphors, relative to
language proficiency. This is also consistent to the simulation-            CONCLUSION
abstraction hybrid view on the mechanism of nominal metaphors
(Al-Azary and Katz, 2021).                                                  Given the difficulties L2 learners experience with metaphoric
   Previous ERP studies that observed a two-stage time course               language comprehension and the paucity of research on
can explain our results. Lai et al. (2019) found that metaphoric            predicate metaphors, this study first explored how embodiment
sense in predicate metaphor is based on concrete action                     influences L2 learners’ processing of predicate metaphors.
semantics because the metaphoric-concrete effect was significant            The sensorimotor elements of action-related pictures
within an early time window (200–500 ms). Obert et al. (2018)               provided a graded priming effect, which was modulated
observed not only an N400, an index of retrieval of an                      by L2 proficiency and metaphor novelty. The present
intermediate entity, but also a late positive effect - an integration       findings not only have important theoretical implications
process that distinguished metaphors from literal expressions.              for embodied cognition and categorization model for metaphor
In the present study, if abstraction or direct categorization               processing, but also offers practical suggestions for L2 acquisition
occurred first or the sensorimotor system played an ephemeral               and teaching.
role, the embodiment priming effect of action pictures should                  However, there are limitations in the study. First, the
have been little. In contrast, a significant effect was found.              familiarity rating for the verbs in the novel metaphors was
Despite being a behavioral experiment, the present study                    relatively lower, although not at a significant level. Second,
contributes to this line of literature by including L2 proficiency,         pictures may carry literal sense of the verb and the present
metaphor novelty and a priming paradigm that can specify                    study did not manage to exclude it from picture priming due
an intermediate entity. However, it remains to be seen what                 to design difficulty. Third, the other types of intermediate
other types of intermediate entity (e.g., prototypical agents               entity were not addressed here. If the hypothesis about indirect
or auditory aspects of verbs) are involved and the findings                 categorization was correct, then it would be expected that the
of present study cannot rule out other processing model of                  auditory aspects of verbs may serve as the intermediate entity
predicate metaphors.                                                        to facilitate auditory predicate metaphor processing. Despite
                                                                            a body of fMRI studies on predicate metaphors, more ERP
L2 Predicate Metaphor Pedagogy                                              and eye-tracking studies are needed to investigate the time
According to the revised hierarchical model (Kroll and Stewart,             course, attention and other qualitative features. For example,
1994), L1 has a stronger link and direct access to meaning,                 participants tend to focus on subject-verb phrases and rate
but L2 is more likely to require mediation via L1 translation               higher metaphoricity for subject-noun phrase sentences over
until the bilingual acquired sufficient L2 proficiency. The                 object-noun phrase sets (Torreano et al., 2005). This indicated
meanings at conceptual levels are shared by L1 and L2, but                  that more attention was given to the first half of the sentence.

Frontiers in Psychology | www.frontiersin.org                           9                                 November 2021 | Volume 12 | Article 759175
Feng and Zhou                                                                                                                      Embodiment Effect on Predicate Metaphor

In summation, future studies should consider verb familiarity,                            (review and editing). Both authors contributed to the article and
conventionality, different types of intermediate entities and                             approved the submitted version.
different experimental methods.
                                                                                          FUNDING
DATA AVAILABILITY STATEMENT
                                                                                          This study was supported by the Guangdong Provincial
The original contributions presented in the study are included                            Philosophy and Social Science Foundation, China [Grant
in the article/Supplementary Material, further inquiries can be                           No. GD20CWY12].
directed to the corresponding author/s.
                                                                                          ACKNOWLEDGMENTS
ETHICS STATEMENT
                                                                                          We would like to thank Prof. Jeanette Littlemore, Prof. Akira
Ethical review and approval was not required for the study on                             Utsum and Prof. Hamad Al-Azar for their insightful comments
human participants in accordance with the local legislation and                           for this work. We also thank Dr. Coco Yu and Prof. Jiushu
institutional requirements. The patients/participants provided                            Xie for their generous help with the experimental design. We
their written informed consent to participate in this study.                              thank Center for Language Cognition and Assessment (SCNU)
                                                                                          for their support.
AUTHOR CONTRIBUTIONS
                                                                                          SUPPLEMENTARY MATERIAL
YF contributes greatly to this study, responsible for
conceptualization, methodology, software, experiment, formal                              The Supplementary Material for this article can be found
analysis, and writing (original draft and editing). RZ was                                online at: https://www.frontiersin.org/articles/10.3389/fpsyg.
responsible for supervision, conceptualization, and writing                               2021.759175/full#supplementary-material

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Frontiers in Psychology | www.frontiersin.org                                            11                                           November 2021 | Volume 12 | Article 759175
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